package reflection;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

//动态地创建对象，通过反射
public class Test09 {
    public static void main(String[] args) throws Exception {
        //获得Class对象
        Class c1 = Class.forName("reflection.User");

        //构建一个对象
        User user = (User) c1.newInstance();
        System.out.println(user);

        //通过构造器创建对象
        Constructor constructor = c1.getDeclaredConstructor(String.class, int.class, int.class);
        User user2 = (User) constructor.newInstance("小飞", 001, 20);
        System.out.println(user2);

        //通过反射调用普通方法
        User user3 = (User) c1.newInstance();
        //通过反射获取一个方法
        Method setName = c1.getDeclaredMethod("setName", String.class);

        setName.invoke(user3,"小飞");//激活
        System.out.println(user3.getName());

        //通过反射操作属性
        System.out.println("======================");
        User user4 = (User) c1.newInstance();
        Field name = c1.getDeclaredField("name");

        //不能直接操作私有属性，需要关闭程序的安全检测
        name.setAccessible(true);//
        name.set(user4,"小飞老师");
        System.out.println(user4.getName());


    }
}
